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Re: Minutes of yesterday's meeting

From: Simon K Johnston <skjohn@us.ibm.com>
Date: Mon, 20 Jul 2009 20:13:21 -0400
To: Ivan Herman <ivan@w3.org>
Cc: W3C SPARQL Working Group <public-rdf-dawg@w3.org>, public-rdf-dawg-request@w3.org
Message-ID: <OF2C00BC1E.AA005240-ON852575FA.00006A6A-852575FA.0001390F@us.ibm.com>
As mentioned in the minutes I had mentioned last week that in trying to 
work through the details of MINUS and UNSAID I wonder if one way to get 
ourselves unstuck is to look at and document some use cases. We do already 
have NOT EXISTS in SQL (and XQuery) and these are well known and used 
today so one might ask what they are used for, what queries require these 
capabilities? For example we might be able to come up with a set of simple 
queries, expressed in natural language, that we can then evaluate the two 
proposals against.

For example, "find me all records where no due date has been set" seems to 
map well to UNSAID, but seems more clumsy when expressed with MINUS - or 
rather the natural expression seems harder to read in the resulting 


Simon K. Johnston (skjohn@us.ibm.com) - STSM, Jazz Foundation Services
Mobile: +1 (919) 200-9973
Office: +1 (919) 595-0786 (tie-line: 268-6838)
Blog: http://www.ibm.com/developerworks/blogs/page/johnston 

Ivan Herman <ivan@w3.org>
W3C SPARQL Working Group <public-rdf-dawg@w3.org>
07/15/2009 05:49 AM
Minutes of yesterday's meeting

Minutes have been uploaded to:


Unfortunately, I forgot to run RRSAgent during the meeting, so I had to
massage my IRC client logs to make it usable with Sandro's script. I
hope nothing went wrong in the process. Sorry about that.



Ivan Herman, W3C Semantic Web Activity Lead
Home: http://www.w3.org/People/Ivan/
mobile: +31-641044153
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FOAF: http://www.ivan-herman.net/foaf.rdf
Received on Tuesday, 21 July 2009 00:14:03 UTC

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